I'm sure talents even in bigger corporations would jump ship at the chance to be in HoloEN3. I bet even the highest grossing nijisanji girls would at least triple their revenue from jumping ship. Though at the moment I don't think we've heard of anyone from a corpo graduating.
Personally I hope Nana Asteria gets in:
She would give Bae a new Aussie mate to hang out with.

And if she would tone down the "dge" (ending a lot of words in dge, like sadge) and let her voice fall closer to her natural voice I think she could be plenty successful. She has great singing chops and is plenty energetic and entertaining.